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Mechanical Behaviour Testing Materials
Advanced Mechanical Behaviour
Quiz 1
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Q.1
Frank-Read source is a mechanism of dislocation multiplication.
a) True
b) False
Q.2
The stress required to activate the longest Frank-Read source would be _____ and _____ on the crystal structure.
a) large, depends
b) large, doesn’t depend
c) small, depends
d) small, doesn’t depend
Q.3
The density of dislocations increases by an order of ____ in magnitude during deformation.
a) 2-4
b) 6-7
c) 8-9
d) 12-13
Q.4
What is density of dislocations in annealed crystal?
a) 108-1010 m-2
b) 1010-1012 m-2
c) 1012-1014 m-2
d) 1014-1016 m-2
Q.5
What is the density of dislocations in heavily deformed crystal?
a) 108-1010 m-2
b) 1010-1012 m-2
c) 1012-1014 m-2
d) 1014-1016 m-2
Q.6
Which metals can be cold worked to the largest extent?
a) FCC
b) BCC
c) HCP
d) SC
Q.7
Higher dislocation density ____ yield strength of the metal.
a) increases
b) decreases
c) doesn’t affect
d) can increase or decrease
Q.8
Dislocations generate on _____ under applied stress.
a) every plane
b) slip planes
c) planes with Frank-Read source
d) {1 1 1} planes
Q.9
The stress required for the generation of dislocation through Frank-Read source is inversely proportional to _____
a) shear modulus
b) burgers vector
c) distance between the pinning sites
d) p-n stress
Q.10
Which factor is not a reason of Frank-Read source immobile pinning sites?
a) Other solute atoms
b) Second phase particles
c) Solvent atoms
d) Intersection with other dislocations
Q.11
Which of the following term is used to refer to the immobile pinning sites in the Frank-Read source?
a) Nodal points
b) Pin points
c) Frank points
d) Shear points
Q.12
The dislocation bowing decreases with increasing applied stress.
a) True
b) False
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